Improvement in saw-mills



UNITED STATES PATENT OFFICE.' Y

.BENJAMIN RICHARDSON AND DAVID RICHARDSON, OF MARTINSBURG, IOWA.

IMPROVEMENT IN SAW-MILLS.

Specification forming part of Iietters Patent No. 109,052, dated November 8, 1870.

To all whom it may concern:

Be it known that we, BENJAMIN FQ RICH- ARDsoN and DAVID RICHARDSON, of Martinsburg, in the county ot' Keokuk and State of Iowa, haveinvented a new and useful Improvement in Saw-Mill Head-Blocks; and we do hereby declare thatthe followingis a full, clear, and exact description thereof, which will enable others skilledin the art to make and use the same, reference being had to the accompanying drawings, forming partof this speciiication.

Ourinvention relates to saw-mill head-blocks, and our object is to introduce to the public certain improvements thereon. rlhese improvements will he first described in connection with all that is necessary to a full understanding thereot', and then clearly specilied-in the claims.

In the accompanying drawings, Figure 1 represents a plan view. Fig. 2 is a vertical cross-section on the line a; a' of Fig. 1. Fig. 3 is a detail of the index for governing the thicknessV of the lumber sawed.

Similar letters ot' reference indicate correspending parts.

A and B represent the carriage-ways upon which the head-block carriages move.

Y O and D are the head-blocks, each of which .is supported on three wheelstwo wheels on the way A, which are grooved toA [ita V guide-rib on that way,7 and one wheel on the way B, which is flat and not ribbed.

.E is a round bar, by which the two headblocks are connected together, or to which they are fastened when they move together. This har is rigidly attached to the feed-rack F, by which the head-blocks are moved when the saw is in operation, or which gives the feed.

G is a shaft with a pinion, G', thereon, which engages with the rack, for moving the headblocks and log.

H H are hand-screws, by which the headblock carriages or chairs are clamped to the bar E. When the log is properly adjusted on the head-blocks the revolution of the pinionshaft Gr carries the log to the saw, or gigs it back, as may be desired.

I is the triangular knee in each head-block,

the horizontal portion of which works in a tongue and groove in the beam ot' the block, the lower edge of which has ratchet-teeth, as seen in Fig. 2.

J is a square bar, which passes through the rear carriages or chairs, by means of which the knees are `moved forward for setting the log.

K is the setting-lever, by which this bnr is turned or partially revolved t'or working the pawls L. The pawls engage with the ratchetteeth in the knee of each head-block for moving the entire log the distance required, according to the thickness of the lumber to be sawed. up to the ratchet-teeth bysprings, as seen, and are disengaged therefrom by means of the levers M, which serve to throw the pawls from the teeth, so as to allow the knees to be moved back. The movement of the log in setting is controlled bythe arrangement seen in Fig. 3.

N is an index-finger on the square shaft J, and O is an arch with a series ot' holes.

P is a fixed pin or starting-point. By placing a pin in one of the holes q, as a stop to the movement of the tinger N, the knees are moved more or less, and the thickness of the lumber sawed is regulated.

R is a lever, and S a pawl in each headblock, by meansof which the head-blocks are moved independently of each other.

T is a dog-lever for each head-block, which have their fulcrums in the ratchet-teeth on the upright portion of the knees I, as seen in Fig. 2. The back ends of these levers are supported by ratchet-teeth on the upright stands U, which are fast in the horizontal portion of the knees.

V is a binding-roller over the cogged rack F.

It will be seen that by this arrangement the head-blocks may he adjusted to suit logs of different lengths by simply loosening one of the hand-screws H from the coupling-bar E. The setting and dogging of the log is accomplished in the most accurate and expeditious manner, and the head-blocks being supported on separate wheels, and operating independ ently of each other, allows the mill to be arranged with far less trouble and expense than ordinary saw-mills.

The points of the pawls are pressed Having thus described our invention, lwe nnmed,the carriages Gand D,const1uc'tedand claim as new and desire to secure by Letters operating as shown and described. Patentl. The shaft', E and hinged rack F, in eombiuation with the feed-shaft G, pinion G', and 'x l remining-WheelV, all constructed and opemt- Titnessesz J. M. WERTZ, A. H. WHEELOOK.

ing,` as and for the purpose specified.

2. In combination with the elements above 

